Today's forum watch has started a new humor thread about the origins of the reopening of the Dark Portal. Many debated if it was Kazzak or some other power, or if it had always been open. Quite a few people had their own opinions about how it opened:
Chuck Norris may have roundhouse kicked it open.
Rick Astley might have "rickroll'd" it open.
Kazzak reopened it because Pokemon Silver came out 3 months earlier in Outlands.
A Blizzard comic submission seems to have their own theories as to how the Dark Portal opened.
A fairly blunt opinion stated that, "Blizzard wanted more money."
I personally like the idea that someone finally discovered what the "unused light switch in their garage" did.